1986 Volume 27 Issue 5 Pages 341-350
By studying the effect of aluminium content on properties of an intermetallic compound TiAl, it has been found that the compound of composition near the stoichiometry possesses significant ductility. For further improvement of ductility, it has been intended to design TiAl-base alloys as a dual structure of the compound and any metal phases. Therefore, metals which are able to be equilibrated with TiAl have been explored, resulting in the fact that silver is only one element which satisfies the requirement in the present experimental scope. For the TiAl alloy of stoichiometric composition and those containing silver of 4–50 mass %, relations among heat-treatment, micro-structures and mechanical properties have been examined.
Experimental results have shown that the TiAl alloys are promising as heat-resistant materials, because they possess excellent high temperature properties. Although the addition of silver improves the ductility of the alloys at room temperature, it lowers high temperature strength.
